test: add await to rejects.toThrowError statements (#3046)

Co-authored-by: Philippe Serhal <philippe.serhal@netlify.com>

Author: mrstork

tests/integration/simple-app.test.ts

@@ -149,21 +149,21 @@ test<FixtureTestContext>('Test that the simple next app is working', async (ctx)
 describe('verification', () => {
   test<FixtureTestContext>("Should warn if publish dir doesn't exist", async (ctx) => {
     await createFixture('simple', ctx)
-    expect(() => runPlugin(ctx, { PUBLISH_DIR: 'no-such-directory' })).rejects.toThrowError(
+    await expect(() => runPlugin(ctx, { PUBLISH_DIR: 'no-such-directory' })).rejects.toThrowError(
       /Your publish directory was not found at: \S+no-such-directory. Please check your build settings/,
     )
   })
 
   test<FixtureTestContext>('Should warn if publish dir is root', async (ctx) => {
     await createFixture('simple', ctx)
-    expect(() => runPlugin(ctx, { PUBLISH_DIR: '.' })).rejects.toThrowError(
+    await expect(() => runPlugin(ctx, { PUBLISH_DIR: '.' })).rejects.toThrowError(
       'Your publish directory cannot be the same as the base directory of your site. Please check your build settings',
     )
   })
 
   test<FixtureTestContext>('Should warn if publish dir is root (package path variant)', async (ctx) => {
     await createFixture('simple', ctx)
-    expect(() =>
+    await expect(() =>
       runPlugin(ctx, { PUBLISH_DIR: 'app/.', PACKAGE_PATH: 'app' }),
     ).rejects.toThrowError(
       'Your publish directory cannot be the same as the base directory of your site. Please check your build settings',
@@ -172,7 +172,7 @@ describe('verification', () => {
 
   test<FixtureTestContext>('Should warn if publish dir is not set to Next.js output directory', async (ctx) => {
     await createFixture('simple', ctx)
-    expect(() => runPlugin(ctx, { PUBLISH_DIR: 'public' })).rejects.toThrowError(
+    await expect(() => runPlugin(ctx, { PUBLISH_DIR: 'public' })).rejects.toThrowError(
       'Your publish directory does not contain expected Next.js build output. Please check your build settings',
     )
   })